// 封装购物车模块

import { defineStore } from 'pinia'
import { computed, ref } from 'vue'
import { useUserStore } from './userStore'
import { insertCartAPI, findNewCartListAPI, delCartAPI } from '@/apis/cart'
export const useCartStore = defineStore('cart', () => {
  const userStore = useUserStore()
  const isLogin = computed(() => userStore.userInfo.token)

  // 获取最新购物车列表action
  const updateNewList = async () => {
    const res = await findNewCartListAPI()
    cartList.value = res.result
  }

  //1.定义state - cartList
  const cartList = ref([])

  //2.定义action - addCart
  const addCart = async (goods) => {
    const { skuId, count } = goods
    if (isLogin.value) {

      //登录之后的加入购物车逻辑
      await insertCartAPI({ skuId, count })
      updateNewList()
    } else {


      //添加购物车操作
      //已经添加过 - count +1
      //没有添加过 - 直接push
      //思路：通过匹配传递过来的商品对象中的skuId能不能在cartList中找到，找到了就是添加过
      const item = cartList.value.find((item) => goods.skuId === item.skuId)
      console.log(item);
      if (item) {
        //找到了
        item.count++
      } else {
        // 没找到
        cartList.value.push(goods)
      }

    }

  }

  //删除购物车
  const delCart = async (skuId) => {

    if (isLogin.value) {

      //调用接口实现接口购物车中的删除功能
      await delCartAPI([skuId])
      updateNewList()

    } else {
      // 思路：
      // 1. 找到要删除项的下标值 - splice
      // 2. 使用数组的过滤方法 - filter
      const idx = cartList.value.findIndex((item) => skuId === item.skuId)
      cartList.value.splice(idx, 1)
    }
  }

  //清除购物车
  const clearCart = async () => {
    cartList.value = []
  }


  //单选功能
  const singleCheck = (skuId, selected) => {
    // 通过skuId找到要修改的那一项 然后把它的selected修改为传过来的selected
    const item = cartList.value.find((item) => item.skuId === skuId)
    item.selected = selected
  }

  //全选功能
  const allCheck = (selected) => {
    cartList.value.forEach((item) => {
      item.selected = selected
    })
  }



  //计算属性
  // 1. 总的数量 所有项的count之和
  const allCount = computed(() => cartList.value.reduce((a, c) => a + c.count, 0))
  // 2. 总价 所有项的count*price之和
  const allPrice = computed(() => cartList.value.reduce((a, c) => a + c.count * c.price, 0))
  //3.已选择数量
  const selectedCount = computed(() => cartList.value.filter((item) => item.selected).reduce((a, c) => a + c.count, 0))
  //4.已选择商品价钱合计
  const selectedPrice = computed(() => cartList.value.filter((item) => item.selected).reduce((a, c) => a + c.count * c.price, 0))
  //是否全选
  const isAll = computed(() => cartList.value.every((item) => item.selected))

  return {
    cartList,
    allCount,
    allPrice,
    isAll,
    selectedCount,
    selectedPrice,
    addCart,
    delCart,
    singleCheck,
    allCheck,
    clearCart,
    updateNewList,
  }

}, {
  persist: true,
})